Abstract
A significant number of X-ray binaries are now known to exhibit long-term periodicities on timescales of ∼10 - 100 days. Several physical mechanisms have been proposed that give rise to such periodicities, one of which is radiation-driven warping and precession of the accretion disk. Recent theoretical work predicts the stability to disk warping as a function of the mass ratio, binary radius, viscosity and accretion efficiency, and we confront this theory with observed longterm behaviour of a sample of neutron star X-ray Binaries. We find good agreement, establishing this mechanism observationally for the high-luminosity systems studied here.
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